The [!^13]@^13 Find expression tells Word to find any string of characters, other than a paragraph break, terminated by a paragraph break.

The \1 Find expression tells Word to find exactly the same string as that found by the expression between the ().

It doesn't matter to the Find what character follows the first digit, provided it's not a paragraph break. Hence numbers 0-9999999... would be found.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]